Two-way plow construction



Oct. 20, 1953 A, PURSCHE 2,655,851

TWO-WAY PLOW CONSTRUCTION FiledAug. 8, 1949 2 Sheets-SheefI yl lll H43@ n4. yescfff,

IN VEN TOR.

" iwf@ Oct. 20, 1953 H. A. PURscHE Two-WAY PLow CONSTRUCTION Filed Aug. 8, 1949 z'sheets-sheet 2 f m c NN.. .MN a V wm m 4. mm N w m N i i W f H Nm Q m m f f..v f, N wN m [Q A mw wk .n .ME

Patented Oct. 20, 1953 UNITED STATES Two-WAY PLOW ooNsmnUcrIoN Harry A. Bursche, Gardena, Calif. Application August s, 19m-,usualfNllteoeoz irclaims. (Cher-'22s.)

l Thisv invention .relates to agricultural implements `and is particularly directed; to improvementsn in a two-wayl plow, constructicln.v` In'imy .prior applcations, Serial No; 760,846', filed July 14, 1947, Serial No. 780,417, YledOctober 17,1947, and Serial No. 18,252, filed March 31, 1948, I'have shown two-way plows having certain. novel ifeatures of construction andoper'ation. These 4three prior applications :are now Patents 2,625,090; 2,625,091; and 2,625,089 respectively, allgrant'ed January 13, 1953. The presentapplication is directed 'to improvements rover the devices shown in those applications.

The principal object of this invention is to provide a single power Acylinder assembly operatively connected for shifting the tonguef'of a wheel-mounted two-way plow, which power cylinder is also effective to latch the tongue in either operative position, to latchfthe roll-over carrier for thev plowshares in .either vof two operative positions, and also'to actuatethe mechanism for selectively limiting vertical movement of the ground-contacting wheels withrespect to the plow frame. The use of a sin'glexpower-'operated cylinder assembly for performing these various functions simplifies the design of the mechanism for controlling the operation of the two-way plow assembly and reduces the number of actuating parts and hydraulic control-flines, resulting in a more simple, rugged design adapted to withstand severe stresses and deflections in service :and less apt to get out-of order.

Two-way plow assemblies as shown-inmy prior applications may use right-hand plowsharesand left-hand plowshares. When the right-hand plowshares are iii-use the-tongfue-of" the plow assembly is shifted to one'positi'on, :andlikewis'e the latches for the roll-overc'arrier and tongue are. in a corresponding position; Furthermore, the limit stops for controlling the positionoff-the supporting wheelswith respect to the frame are also in a corresponding-position since therighthand supporting wheel rolls inthe furrow when the right-hand plowshares Vare in operation.

When'the carrier isshiftedto bring the righthand plowshares out ofthe ground and A'toposition the left-hand plowshares in plowing posi-tion the tongue, tongue-latch mechanism, the-carrier latch, and wheel elevation controll mechanism arev all 'shifted to the other position.` It'is'unnecessary duringnormal operation of the twov way plow assemblyA to have individual.'control of these several` mechanisms, and ,in accordance with my invention a .single power cylinder isfoperativel'y` connected to actuate these -severalinstru-mentalities at1thesameti-me.Y

.A-nothen obj ectY of i my,l inventionfis tu4 provide a- -novelf form of'meohanism :for: controlling-1. the height.7 cfr. :the f supporting 'wheels with; respeetf to theff-raine:A l l Y. y

, Another-A-,objectr is; to provide ,tongue-latching mechanism which .,isf'ranchored -lt'o one-end of z the power 4cylinder assembly andy tongue-swinging mechanism which connected vto tlfierothery end of the power cylinder assembly-.fl l

Other and more detailed objectsfa-nd' advantages willv appear hereinafter.

In the drawings:

Figure l is' a perspectiveviewof afdevice embodying my invention; thee tongue being broken off and the -towingvehicle or Atractorremitted.-`

Figure 2 is a side: elevation-partlybroken away showing details; ofA 'construction vofl the:- plow frame.-

Figure 3 is a plan'view-partlyxbroken Aaway showing details of construction.

Referring t'o Ithe: drawing-5;, the: frame? vl 0: is supported 'on laterallyyspacedrside,wheels `l i and l2 andis-ztowedbehind-a. tractorror other ltowing vehicle- (not shown) by means of? aiy tongue I3. A central `longitudinal beam l4is rigidly secured to and" forms 'a apart' of t they framezfl 0 .'an'd extends vrearwardly therefrom `in a generally horizontal direction. Rotatab1y'mounted: onY this stationary beamgi4-is1a sleevef|5 `constituting: a portion-of a carrier I6; The carrier li'supports a :right-hand plowsharev l 1 and a left-'hand' plowshare IB and also.:supports1 anpair of: Vscraper blades I6a'ndn2ll.` The carrieryil'6 maybe: rotated through approximately a one=half; revolution to bring; .either plowshare into `operativefpositiorras desired. Power meansara'r'e"providediforf'turning thefcarrier` I 6, .and as shown yint-'the `'drawings :this power means ,includes a; double-endedw power cylinder assembly 21 havngpiston. 'rods' 22 :extendingfrom opposedlends thereof.v A pulley'2'3rris carriedon the end offeach `of these rods.l Afiiexible cable-Misanchored fat'eachrendfby brackets A25 and extends around thepul1eys231andaround the drumr 26 -formediontthefcarrierL |651 Movement of the piston.y rodsfcausesithe- Ycarrierrto: be swung; fromone position tothe other.. This-smotion' of the carrier is accomplished when thefframe Iltis-elevated to'loringthedongitudinal beam i4"to y asuiciently highposition sothat'both the-plowispivotallyattached tothe framefl Ufnearthe rear end "thereof,-v and whichcarries. one; 'of i the :Iside supportingrwheels atv itsiforwardiend. Power cylinder assemblies 28 and 29 are provided for swinging the crank arms 21, and each is provided with an extensible piston rod 30. Each rod 30 is provided with a block 4 fixed at its lower end, which block is connected to one of the crank arms 21 by a pivot pin 5. A nut 6 is threaded on each rod 30 and a pair of upstanding arcuate bumpers 1 are Welded to the nut. The upper ends 8 of the bumpers strike the lower end 9 of one of the cylinder assemblies to limit pivotal movement of its respective wheel arm 21. The assemblies 28 and 29 are each connected by means of a pivot bolt 32 to an A-frame structure 33 attached to the frame l0. The power cylinder assemblies 28 and 29 are hydraulically connected for operation in unison. Since one of the side supporting wheels rolls in the furrow When the right-hand plowshare is in service, .and since the other side supporting wheel rolls in the furrow when the left-hand plowshare is in service, means are provided for limiting the extent of -movement of the side supporting wheels with respect to the frame I0. In this way the frame l0 is maintained in a substantially horizontal position regardless of which of the side supporting wheels is rolling in the furrow. It will be understood that the other wheel in any case rolls on unplowed ground.

As shown in the drawings, each of the crank arms 21 is provided with a block 3d which is l adapted to be engaged by swinging limit stops 35 and 3E. Each of these limit stops is carried on a vertical shaft 31, 38 supported for rotation on the frame i!) by means of brackets 38a. Crank arm 39 is fixed to the shaft 31, and similarly, crank arm 4E) is ixed to the shaft 33. A tie bar il is pivotally connected at its ends to the free ends of the crank arms 33 and 43. Accordingly, shifting of the tie bar 4| serves to extend one of the swinging limit stops 35, 33 and simultaneously to retract the other. When the swinging limit stop 35 is positioned over the block 34 as shown in Figure 3 the angular travel of the wheel supporting crank arm 21 is limited. The limit stop is employed for the particular wheel which rolls in the furrow. When the piston rods 3Q are extended to raise the frame i3, both wheels i i and I 2 are lowered to the maximum extent, but when the piston rods 38 are allowed to be retracted into their respective cylinders the crank arm for the furrow7 wheel engages one of the limit stops 35, 33 so that the other wheel rises with respect to the frame to compensate for the depth of the furrow and to maintain the frame in substantially horizontal position.

In order that the two-way plow device may be properly positioned behind the towing vehicle whether plowing a left-hand furrow or a righthand furrow, it is essential to employ a swinging tongue. As shown in the drawings the tongue i3 includes a pair of parallel channel members i2 which is connected to the frame by means of pivot pins 43. A tiltable draft element lll is connected to the box section 42a at the forward end of the channels l2 by means of a horizontal connecting pin lilla. Means are provided for shifting the tongue about its pivot pin g.3, and as shown in the drawings this means includes the power cylinder assembly d5. This assembly includes a hydraulic cylinder 46 having a piston reciprocable therein and connected to a piston rod 41. The cylinder 46 is pivotally connected to a transverse beam 48 by means of pivot pin 49, while the piston rod 41 is connected to the bracket 50 by means of the pivot bolt 5|. The bracket 5;@ is

secured to the tongue channel 42 so that when the piston rod is extended as shown in Figure 3 the tongue is shifted to the left and when the piston rod 1 is retracted the tongue is shifts' to the right.

An upwardly extending linger 52 is provided on the tongue element d2, and coil springs 53 and 5f@ connect this nnger with I-bolts 55 and 5t respectively mounted on the opposite ends of the tie bar di. From this description it will understood that when the tongue is shifted to the left as viewed in Figure 3 the spring 55 moves the tie bar l to the left, thereby extending the swinging limit stop 3d and retracting the swinging limit stop 35. Similarly, when the tongue is shifted to the right the spring 53 moves the tie bar il to the right, thereby retracting the stop element 35 and extending the stop element 35.

Means are provided for latching the tongue in either the rig.t or left position, and as shown in the drawings this means includes a of latching lugs 51 and 58 each pivotally connected to the forward end of the frame by means of the pivot pins 553. These pivot pins are attached to stop elements 63 which are welded cr otherwise attached to the curved cross-piece el at the forward end of the frame it. Each of the pivoted latching lugs 5i and 58 is adapted to extend between the upper and lower channels '52 of the tongue structure and to engage one of the side plates forming the box section 42a. The curved cross-piece 6i is provided with openings S3 through which the swinging ends of the latching lugs 51 and 'Et-may pass toward iatching position. Means are provided for simultaneously actuating the latching lugs so that one is retracted and the other is extended, and as shown this means includes a latching bar 3 pivotaliy connected to the beam ill by means of the pivot bolt 61%. A bracket 55 is secured'on each of the ends of the bar 63 and actuating rods 55 exten-:l through an eye 51 provided on each of the brackets 55. A washer iis iixed to each actuating rod forms a stop for one end of a coil spring $9 securing a portion cf the actuating rod. The other end of the spring rests against the eye The actuating rods are each pivotally connected to one of the latching lugs 5? and From this description it will be understood that when the latching bar 153 is pivoted about the holt one of the latching lugs is positivel;7 retracted and the other is urged by its spring 53 toward latching position. A washer l@ locking nuts 1i are provided near the ends of the actuating 5y: tri.

1rods 65 to form an abutment cooperating with the eye 61 on the bracket 65 to retract the actuating rod and locking lug.

The pivotal connection 49 for the power cylinder assembly 46 is attached to the latc'ning 63 so that when the piston rod is extended the reaction force tends to pivot the latching bar 63 in a clockwise direction as viewed in Figure S. When the piston rod di is retracted the reaction force on the pivotal connection 129 swings the latching bar S3 in a counterclockwise direction, thereby retracting the latching lug 5l and re'n siliently urging the latching lugs 5S toward latching position.

As set forth in my prior application, Serial No. 18,252, it is desirable to latch the roll-over car rier I6 with respect to the frame so that the right-hand plow or the left-hand plow is firmly latched in position. In order to accomplish this result, I provide a protuberance 12 on the carrier i6 which is adapted to engage stops 13 on one accessor- 'sideso'f theifframef-'orstops;.1f5:.on-ftlie'other side. Pivotedilatcliing ingers .l 1. andi'' are provided adjacent the-1stops--'i3sand N... As best shown .in

'moving fone. xof .the latchinginger's .l 5, l toward latching. `.position fand iretraicting.. the. otherv away from latching position.

Each :ofLthe latching.fingers"l5.` andl 'I6 may be provided withna spring 8A; whichA acts vto pivot vthe latching ngertow-ard latching position. The .upper endA :85 of 1 each late-hing.v finger. is ',rounded orzbevelled .so that the alatcl'iing.v protuberance 12 may detlect'ieither latching: finger suiciently to engage-the stop; l or 'l d..

In operation the tWo-way,plow.assembly may begtowed behindfa tractor or; other` towing vehicle toA ther held-where the-plowing is to take place. During the .towingoperationthe power cylinder assemblies: 23 land 219. yare .fully Vextended so that the frame-.Uris raised'clear of the ground for a.maximum=extent. When the frame is in its fully-:elevated position'vthe plowshares I1 and I8, as well'fas the. Scrapers il Sand 20, clear the ground level for,v convenient transportation; When the eldto ,be plowed is reached the operator actuates suitable hydraulic `control valves. on the towing vehicle, which:valvesfarefconnectedto control operation Aof the power cylinder f assemblies. on the two-way plow through hydraulic connections `88. The lpowercylinder assemblies123 fand-129 maybe positively lactuated to' extend Jor retract their Arespective piston rods 30. The depth of .the-,furrow isregulatedby changing. thefposition of the-ladjusting nuts` 6-on the piston Arod-s'3ll. Onefof the plowshares Il Vor lI genters the ground as .thefplow assembly is towedbehindthe. tractor. One-of the Scrapers acts to4 remove: weedsy andlothe-r trashV which might interfere. with properv actuation'of the main-plowshare.

During, theY plowing: operation thefu tail wheel 8-1 which is mounted fonthefcarrier I6 rolls on the unplowed .ground and :controls they-.depth of the furrow. as set.forthfullyfin:mycopending applications. Aiurrow ismade forthe `lengthof the field, and when the-end of the elds'reached the power cylinder assemblies 28 land 23 are pressurizedto lift the-frame and ploWshare-out of the ground and to-lift thetail wheel B1. The double-ended power cylinder 2| is then'actuated to roll the carrier -I 6 lto bringv the other plowshare into 'operative position with'reg-ard to -theframe lil.' The tractor and plow are then'turned around and proceed back along the furrow previously made with one of the side wheelsll or l2 rolling in the furrow and the-other rollingvonlunplowed ground. One of -theswinging limit stops 35, 35 is extended adjacent the wheel which rolls in the furrow so that the frame IllAV is maintained substantially in level position. This limit stop is extended when the tongue assembly I3-is shifted by means of the `powercylinder assembly 46. Asset forth hereinabove, shifting offthetongue. 'I3 is accomplished Vby;latching-*ofthe tongue inf its new position, projecting; of fthe Aproperlimit stop 35, 53.642.andautomaticdatchingof the carrier lin-its nemposition. .Asthe.: tractor and lplow fproceed aci-ossa1 the :..telwdfthe..Iorward portion 44 f of the draft tongue assemblyvI-S-,isfree-to swing vvertically fabnututhe-horizontal :pivot pin '44a so that now-vertical yload :isirnposedon the tractor and sor tlratr-'theplowf rolls vvon itsY three supporting wheelsindependentlyofivertical motion of the tracton.

Having yfully.described .my invention, it is to be understood thatlIfdo :not wish to be limited to thee'detailsfherein-fsetiiforth, but :my invention is of thregzfull .scope offtheappended claims.`

l. I1'i.a .twof `way fplow..:assembly, the combination of ^aframe l'iavinfgA a :stationary longitudinal bearrr.extending :from vthe -rear thereof, a carrier turnably mounted on the beam .and provided lwith aerightrhand `plowfa-nd a left .hand plow, arms pivotallvmountedronthe sides ofthe frame, a groun'dlwheelcairied :oneach arm, vpower means foraswingingeach arm-forraising the frame relative.: to ,ther grcundwheels a draft tongue, pivot meansponnecting vthe-draft tongue to .the "frame, Wh'erebylthe tongue may have substantially horizontal swinging movementrelative to the frame, a l. pair of.- lirnit a stop' elements Aeach mounted for substantially horizontallswinging movement relative .to .the-frame, yeachfstop .element being movabiefianinoperative retracted position to an operativerprojecting-position overlying a portion oliicneloisaidtarmseeach stop element in projectingv 4pnsition-Jac'tingto` limit pivotal movement of one of; the: armswith respect. tosaid frame, a power,cylindersassemblyfoperatively connected to swing-:the draftgton'gueto either of `two positions, a tie bar operativelyconnected to said stop Velementsforv retractingfone while projecting the 'oftherfandvice versa, and means operated by the tongue for shi-ftingithe tie bar.

2J In a two way #plowV assembly, the: combinationoi` a frame havinga stationary longitudinal .beameextendingfrom the Vrear thereof, a carrier turnab'ly-.rnounted 'onthefbeam and provided Vwith a. right :hande plowr f and: a left. hand plow, arms pivotallyzfmounted-.on the sides of the frame, a ground'fwheelfcarried'on each arm, power means for swingingV each'armefor raising the frame relative-,to .the groundwheels, a draft tongue, pivot meansr connecting-.thedraft tongue to the beam 4near the: rear ofthe-frame, Awhereby the tongue may .have..substantia1ly horizontal swinging movementrelative.toth'eirama a-pair'of limit stop elements.y each mounted for substantially vhorizontal swingingmovement'relative to the frame, eachstopnelement .beingmovable from 'an inoperativeretracted position to an operative projecting positionoverlyingaportion of one of said arms, each stop-element in projecting position acting; to limiti pivotal movement of one of the arms :with respect to said-frame, a power cylinder assemblyroperatively-Aconnected to swing the draft tongue-to -eith'erof-ftwo positions, a tie bar operatively ,f cormectedj to i said stop elements for retractingfgone while -projecting the 'other and vice versa, and spring=means operated by the tongue for `shifting they tief bar.

- grdundwheel zcarried :on :each arm, power-v means for swinging each arm for raising the frame relative to the ground wheels, a draft tongue, pivot means connecting the draft tongue to the frame, whereby the tongue may have substantially horizontal swinging movement relative to the frame, a pair of limit stop elements eachV mounted for lateral movement relative to the frame, each stop element being movable from an inoperative retracted position to an operative projecting position overlying a portion of one of said arms, each stop element in projecting position acting to limit pivotal movement of one of the arms with respect to said frame, a power cylinder assembly operatively connected to swing the draft tongue to either of two positions, a tie bar operatively connected to said stop elements for retracting one while projecting the other and vice versa, and means operated by the power cylinder for actuating said stop elements.

e. In a two way plow assembly, the combination of a frame having parallel side members, a carrier turnably supported with respect to the frame and provided with a right hand plow and a left han@ plow, arms pivotally mounted on the sides of the frame, a ground wheel carried on each arm, power means for swinging each arm for raising the frame relative to the ground wheels, a pair of limit stop elements each pivotally mounted on one of the side members for lateral movement relative to the frame, each stop element being movable from an inoperative retracted position to an operative projecting position overlying a portion of one of said arms, each stop element in projecting position acting to limit pivotal movement of one of the arms relative to the frame, and a tie bar pivotally connected to said stop elements for retracting one while projecting the other and vice versa.

5. ln a two way plow assembly, the combination of a frame, a carrier turnably supported with respect to the frame and provided with av right hand plow and a left hand plow, arms pivotally mounted on the sides of the frame, a ground wheel carried on each arm, power means for swinging each arm for raising the frame relative to the ground wheels, a pair of limit stop elements each mounted for substantially horizontal swinging movement relative to the frame, each stop element being movable from an inoperative retracted position to an operative projecting position overlying a, portion of one of said arms, each stop element in projecting position acting to limit pivotal movement of one of the arms relative to the frame, and a tie bar operatively connected to said stop elements for retracting one while projecting the other and vice versa.

6. In a two way plow assembly, the combination of a frame, a carrier turnably supported with respect to the frame and provided with a right hand plow and a left hand plow, arms pivotally mounted on the sides of the frame, a ground wheel carried on each arm, power means for swinging each arm for raising the frame relative to the ground wheels, a pair of limit stop elements pivotally mounted for substantially horizontal swinging movement relative to the frame, each stop element being movable from an inoperative retracted position to an operative projecting position overlying a portion of one of said arms,

each stop element in projecting position acting to limit pivotal movement of one of the arms relative to the frame, and means operatively connected to said stop elements for retracting one while projecting the other and vice versa.

7. In a two way plow assembly, the combination of a frame having side members, a carrier turnably supported with respect to the frame and provided with a right hand plow and a left hand plow, arms pivotally mounted on the side members of the frame, a ground wheel carried on each arm, power means for swinging each arm for raising the frame relative to the ground wheels, a pair of limit stop elements, vertical pivot elements for supporting each of said stop elements for substantially horizontal swinging movement beneath the side members of the frame, each stop element being movable from an inoperative retracted position to an operative projecting position overlying a portion of one of said arms, each stop element in projecting position acting to limit pivotal movement of one of the arms relative to the frame, and a tie bar operatively connected to said stop elements for retracting one while projecting the other.

8. In a two-way plow assembly, the combination of a frame having side members, a carrier turnably supported with respect to the frame and provided with a right-hand plow and a left-hand plow, arms pivotally mounted on the side members of the frame, a ground wheel carried on each arm, power means for swinging each arm for raising the frame relative to the ground wheels, means for selectively limiting pivotal movement of said arms, a pair of limit stop elements, vertical pivot elements for supporting each of said stop elements for substantially horizontal swinging movement beneath the side members of the frame, each stop element being movable from an inoperative retracted position to an operative projecting position overlying a portion of one of said arms, each stop element in projecting position acting to limit pivotal movement of one of the arms relative to the frame, and a tie bar operatively connected to said stop elements for retracting'one while projecting the other.

9. In a two way plow assembly, the combination of a frame, a carrier turnably mounted on the frame and provided with ground-engaging plow means for producing either a right-hand furrow or a left-hand furrow, arms pivotally mounted on the sides of the frame, a ground wheel carried on each arm, power means for swinging each arm for raising the iframe relative to the ground wheels, a draft tongue, pivot means connecting the draft tongue to the frame, whereby the tongue may have substantially horizontal swinging movement relative to the frame, a pair of limit stop elements each mounted for substantially horizontal swinging movement relative to the frame, each stop element being movable from an inoperative retracted position to an operative projecting position overlying a portion of one of said arms, each stop element in projecting position acting to limit pivotal movement of one of the arms with respect to said frame, a power cylinder assembly operatively connected to swing the draft tongue to either of two positions, a tie bar operatively connected to said stop elements for retracting one while projecting the other and vice versa, and means operated by the tongue for shifting the tie bar.

10. In a, two way plow assembly, the combination of a frame, a carrier turnably mounted on the frame and provided with ground-engaging plow means for producing either a right-hand furrow or a left-hand furrow, arms pivotally mounted on the sides of the frame, a ground wheel carried on each arm, power means for swinging each arm for raising the frame relative to the ground wheels, a draft tongue, pivot means connecting ,the draft; :tongue: ,to the; beam near fthe.; rear ,ofthefframa. whereby the tonguef'may `have substantially` horizontal; swinging-movement Y relative;to theg: frame .z apair: ofglimitsstopfelements each mounted for substantiallyhorizontal swingingamovementrelativeto the frame, each stop element being movable from an inoperative retracted-,position to..an.l operative-` projectinge pnsition overlyingA a portion of one ofsaid-arms, each stop element in projecting position acting to limit pivotalmovement of one ofthe arms with'y respect to` saijd frame, a power 'cylinder assembly` operatively connected to swing AVthe draft rtongue jto either of two positions, atiebar operatively'connected to said stop'elements for retractingone` vwheel carried on each arm, power means for swinging each arm for raising'the frame. relative tothe ground wheelsa, drafttongue, pivot vmeans connecting .the draft r.tongue tothe frame, whereby the tonguey may have substantially horizontal swinging movement relative to the frame, a pair of limit stop elements each mounted for lateral movement relative to the frame, each stop element being movable from an inoperative retracted position to an operative projecting position overlying a portion of one of said arms, each stop element in projecting position acting to limit pivotal movement of one of the arms with respect to said frame, a power cylinder assembly operatively connected to swing the draft tongue to either of two positions, a tie bar operatively connected to said stop elements for retracting one while projecting the other and vice versa, and means operated by the power cylinder for actuating said stop elements.

l2. In a two way plow assembly, the combination of a frame, a carrier turnably supported with respect to the frame and provided with groundengaging plow means for producing either a right-hand furrow or a left-hand furrow, arms pivotally mounted on the sides of the frame, a ground wheel carried on each arm, power means for swinging each arm for raising the frame relative to the ground wheels, a pair of limit stop elements each mounted for substantially horizontal swinging movement relative to the frame, each stop element being movable from an inoperative retracted position to an operative projecting position overlying a portion of one of said arms, each stop element in projecting position acting to limit pivotal movement of one of the arms relative to the frame, and a tie bar operatively connected to said stop elements for retracting one while projecting the other and vice versa.

13. In a two way plow assembly, the combination of a frame, a carrier turnably supported with respect to the frame and provided with groundengaging plow means for producing either a right-hand furrow or a left-hand furrow, arms pivotally mounted on the sides of the frame, a ground wheel carried on each arm, power means for swinging each arm for raising the frame relative to the ground wheels, a pair of limit stop elements pivotally mounted for substantially horizontal swinging movement relative to the frame, each stop element being movable from an inoperativeirretracted positiongto`` an. operative: projectfing positiongfoverlying, ,agportionxofone of said .-arms, each-stop element projectingposition acting to limit pivotal movement Vof, one of the arms relative to' the. frame; and means operatively .-connectedtosaid.stop,elements fory retracting, one -whilaprojecting .the other and .vice versa.

14..;.Ina two .,way plow assembly, thecombination-k. off. a.. frame having side f-members, a. carrier f,turnably.supportedwwith respectto vthe. frame .and provided withgground-,engaging plow means,-A for prodncing either-a. right-handi-urrow. or al lefthand furrow, arms. pivotally. mounted lon the side Linembersof, the.- frame, aground. wheel carried on each.. varm,`v vpower means.-y forl .swinging each arm for raising .the framerelative. to vthef.ground .wheelsm pair.. of.V limit ,stop elementsvertical Apivot :elements-.for supporting ,each.of;.said stop ele- .ments .for lsubstantially horizontal. swinging :movement beneaththesde membersofthe frame, each.stop-. element. being movable from an, inoperative .retracted pnsition-:toY an operative,v projecting position overlying aportion-.ofone oisaid yarms .eachstop elementinprojecting position acting to limit... pivotal .movement of.k one.` of4 ,the arms. relative. to the.4 frame, .anda tiebar. opera- .tively connected to. l.said stop elements vfor retracting one vwhile,projecting .the.other.

. l5. A in. .ati/vo plow` assembly, the combination of a frame having side members, a carrier turnably supported with respect to the frame and provided with ground-engaging plow means for producing either a right-hand furrow or a lefthand furrow, arms pivotally mounted on the side members of the frame, a ground wheel carried on each arm, power means for swinging each arm for raising the frame relative to the ground wheels, means for selectively limiting pivotal movement of said arms, a pair of limit stop elements, vertical pivot elements for supporting each of said stop elements for substantially horizontal swinging movement beneath the side members of the frame, each stop element being movable from an inoperative retracted position -to yan operative projecting position overlying a portion of one of said arms, each stop element in projecting position acting to limit pivotal movement of one of the arms relative to the frame, and a tie bar operatively connected to said stop elements for retracting one while projecting the other.

16. In a two way plow assembly, the combination of a frame, a carrier turnably mounted on the frame and provided with ground-engaging plow means for producing either a right-hand furrow or a left-hand furrow, rearwardly extending arms pivotally mounted on the sides of the frame, a ground wheel carried on each arm, power means for swinging each arm for raising the frame relative to the ground wheels, a draft tongue, pivot means connecting the draft tongue to the frame whereby the tongue may have substantially horizontal swinging movement relative to the frame, a pair of retractable limit stop elements each mounted for lateral movement relative to the frame, each stop element being movable from an inoperative retracted position to an operative projecting position overlying a portion of one of said arms, each stop element in projecting position acting to limit pivotal movement of one of the iarms with respect to said frame, a power cylinder assembly operatively connected to swing the draft tongue to either of two positions, and mechanical linkage means operatively connected to said stop elements and said draft tongue for retracting one of the stop tion of a frame, a carrier turnably mounted onv the frame land provided with ground-engaging plow means for producing either a right-hand Vfurrow or a left-hand furrow, rearwardly extending arms pivotally mounted on the sides of the frame, a ground wheel carried on each arm, power means for swinging each arm for raising v the frame relative t0 the ground wheels, a draft tongue, pivot means connecting the draft tongue to the frame whereby the tongue may have substantially horizontal swinging movement relative to the frame, adjustable stop elements Vadapted to limit the maximum movement of respect to said frame, a power cylinder assembly operatively connected to swing the draft tongue to either of two positions, and mechanical link- Vage means operatively connected to said stop element and said draft tongue for retracting one of the stop elements while projecting the other and vice Versa in response to swinging movement of the draft tongue.

HARRY A. PURSCHE.

References Cited in the fle of this patent UNITED STATES PATENTS Number Name Date 1,908,095 York Mayr9, 1933 1,915,844 York June 27, 1933 2,136,911 Briscoe Nov. 15, 1938 2,188,413 Markel Jan. 30, 1940 2,195,631 Post Apr. 2, 1940 2,304,383 Strandlund Dec. 8, 1942 2,316,397 Briscoe Apr. 13, 1943 2,327,927 Orelind Aug. 24,1943 2,426,548 Capon Aug. 26, 1947 FOREIGN PATENTS Number Country Date 36,190 France Jan. 18, 1930 Addition to 660,208

708,918 France May 5, 1931 1,150 Great Britain of 1872 265,607 Great Britain Jan. 26, 1928 603,461

Great Britain June 16, 1948 

